notifyDatasetChanged()之后RecyclerView闪烁

DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(new MyDiffCallback(oldData, newData));
diffResult.dispatchUpdatesTo(adapter);

recyclerView.setItemAnimator(null);

adapter.notifyItemRangeChanged(startPosition, itemCount);

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<MyData> dataList;

    public MyAdapter(List<MyData> dataList) {
        this.dataList = dataList;
    }

    public void updateData(List<MyData> newData) {
        DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(new MyDiffCallback(dataList, newData));
        dataList.clear();
        dataList.addAll(newData);
        diffResult.dispatchUpdatesTo(this);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        MyData data = dataList.get(position);
        holder.textView.setText(data.getText());
    }

    @Override
    public int getItemCount() {
        return dataList.size();
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

        ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
    }

    static class MyDiffCallback extends DiffUtil.Callback {
        private List<MyData> oldData;
        private List<MyData> newData;

        MyDiffCallback(List<MyData> oldData, List<MyData> newData) {
            this.oldData = oldData;
            this.newData = newData;
        }

        @Override
        public int getOldListSize() {
            return oldData.size();
        }

        @Override
        public int getNewListSize() {
            return newData.size();
        }

        @Override
        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
            return oldData.get(oldItemPosition).getId() == newData.get(newItemPosition).getId();
        }

        @Override
        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
            return oldData.get(oldItemPosition).equals(newData.get(newItemPosition));
        }
    }
}